HiFonics ZRX6D2

The HiFonics ZEUS POWER ZRX6D2 is a powerful 16.5 cm (6.5-inch) subwoofer that delivers impressive bass performance despite its compact size. Designed for demanding car audio applications, it combines high power handling with a robust construction and precise bass reproduction.

The powerful dual-magnet system, combined with the generously sized 50-mm dual voice coil, ensures high-performance drive. The specially developed, coated paper cone and the double-stitched foam surround with a ribbed structure enable controlled cone movement even at high volume levels.

Additional stability is provided by the dual polycotton centering, the generous rear ventilation, and the high-quality die-cast aluminum basket. This design reduces unwanted compression effects and supports dynamic, powerful bass reproduction.

Thanks to its compact design, the ZRX6D2 is particularly well-suited for space-saving subwoofer installations. Even in small bass-reflex enclosures, it can deliver impressive low-frequency performance.

The HiFonics ZRX6D2 was honored with the prestigious EISA Award 2020–2021 for Best In-Car Subwoofer.

Technical Specifications

• Manufacturer: HiFonics

• Series: ZEUS POWER ZRX

• Model: ZRX6D2

• Product Type: Passive Subwoofer

• Speaker size: 16.5 cm (6.5 inches)

• RMS Power Handling: 300 watts

• Maximum power handling: 600 watts

• Impedance: 2 + 2 ohms

• Voice Coils: Dual Voice Coil (DVC)

• Voice coil diameter: 50 mm

• Voice coil winding height: 25 mm

• Diaphragm material: Coated, unpressed paper diaphragm

• Binding: Double-stitched foam binding with a ribbed texture

• Centering: Double polycotton centering spider

• Basket material: Die-cast aluminum

• Magnet system: Double magnet

• Magnet Cover: Blue Magnet Protector

• Linear diaphragm stroke (Xmax): ± 8.5 mm

• Maximum mechanical diaphragm stroke: ± 15 mm

• Efficiency (1 W/1 m): 82 dB
  
  

Thiele-Small parameters

• Resonance frequency (Fs): 53.9 Hz

• Total Quality (Qts): 0.46

• Electrical Quality (Qes): 0.54

• Mechanical Quality (Qms): 3.03

• Equivalent air volume (Vas): 3.2 liters

• DC resistance (Re): 2 × 2 ohms

• Inductance of the voice coil (Le): 1.7 mH

• Effective membrane area (Sd): 134 cm²

• Mass in motion (Mms): 68.2 g

• Force factor (BL): 13.08 N/A
  
  

Dimensions

• Outer diameter: 182 mm

• Installation diameter: 151 mm

• Installation depth: 106 mm

• Magnet diameter: 134 mm

• Magnet height: 35 mm

• Shipping weight according to the data sheet: 5.0 kg
  
  

Recommended Enclosures – Bass-Reflex

Option 1 – Sound Quality

• Tank capacity: 10 liters

• Bass reflex port diameter: 66 mm

• Bass reflex port cross-sectional area: 34 cm²

• Bass reflex tube length: 40 cm

• Tuning frequency (Fb): 47 Hz

• Lower cutoff frequency (F3): 40 Hz
  
  

Option 2 – Sound Pressure Level (SPL)

• Tank capacity: 15 liters

• Bass reflex port diameter: 70 mm

• Bass reflex port cross-sectional area: 38 cm²

• Bass reflex tube length: 26 cm

• Tuning frequency (Fb): 49 Hz

• Lower cutoff frequency (F3): 41 Hz
  
  

What's Included

• 1 × HiFonics ZEUS POWER ZRX6D2 subwoofer, 16.5 cm (6.5 inches)